Fully Secure Identity-based Broadcast Encryption in the Subgroups  

子群中完全安全的基于身份的广播加密(英文)

作　　者：张乐友 胡予濮 吴青 

机构地区：[1]Department of Mathematical Science,Xidian University [2]Key Laboratory of Computer Networks and Information Security,Ministry of Education,Xidian University [3]School of automation,Xi'an Institute of Posts and Telecommunications

出　　处：《China Communications》2011年第2期152-158,共7页中国通信（英文版）

基　　金：supported by the Nature Science Foundation of China under grant 60970119, 60803149;the National Basic Research Program of China(973) under grant 2007CB311201

摘　　要：In this paper,we show how to use the dual techniques in the subgroups to give a secure identity-based broadcast encryption(IBBE) scheme with constant-size ciphertexts. Our scheme achieves the full security(adaptive security) under three static(i.e. non q-based) assumptions. It is worth noting that only recently Waters gives a short ciphertext broadcast encryption system that is even adaptively secure under the simple assumptions. One feature of our methodology is that it is relatively simple to leverage our techniques to get adaptive security.In this paper,we show how to use the dual techniques in the subgroups to give a secure identity-based broadcast encryption(IBBE) scheme with constant-size ciphertexts. Our scheme achieves the full security(adaptive security) under three static(i.e. non q-based) assumptions. It is worth noting that only recently Waters gives a short ciphertext broadcast encryption system that is even adaptively secure under the simple assumptions. One feature of our methodology is that it is relatively simple to leverage our techniques to get adaptive security.

关 键 词：identity-based broadcast encryption dual system encryption full security static assumption SUBGROUP provable security 

分 类 号：TN93[电子电信—信号与信息处理] TP309.7[电子电信—信息与通信工程]